Intraspecific Variation in Commuting Distance of Marbled Murrelets (Brachyramphus marmoratus): Ecological and Energetic Consequences of Nesting Further Inland
نویسندگان
چکیده
منابع مشابه
Morphometric Variation in Marbled Murrelets, Brachyramphus Marmoratus, in British Columbia
Morphometrics (culmen length, bill height, bill width, wing chord length, and tarsus length) were taken on 664 marbled murrelets at Desolation Sound and Mussel Inlet, British Columbia, during 1994 to 1997, in order to assess morphological differences within and between populations and the accuracy of a discriminant function analysis to identify the sex of birds. An assessment of interand intra-...
متن کاملPost-fledging Survival of Marbled Murrelets Brachyramphus Marmoratus Estimated
Post-fledging juvenile survival rates are difficult to measure, particularly for seabirds (Harris et al. 1994, Gaston 1997). However, several studies have highlighted the demographic importance of estimates of survival during the first year, and until first breeding, for both seabirds (e.g. Hudson 1985) and birds in general (e.g. Ganey et al. 1998, Hafner et al. 1998). Such estimates are partic...
متن کاملMarine Habitat Selection by Marbled Murrelets (Brachyramphus marmoratus) during the Breeding Season
The marbled murrelet (Brachyramphus marmoratus) is a declining seabird that is well-known for nesting in coastal old-growth forests in the Pacific Northwest. Most studies of habitat selection have focused on modeling terrestrial nesting habitat even though marine habitat is believed to be a major contributor to population declines in some regions. To address this information gap, we conducted a...
متن کاملComparison of Aerial and Boat-based Survey Methods for Marbled Murrelets Brachyramphus Marmoratus and Other Marine Birds
We compared density estimates for marine birds off central California from simultaneous aerial and boat-based surveys, with a special emphasis on Marbled Murrelets Brachyramphus marmoratus. We surveyed 44 eight-kilometer transects in nearshore waters of Monterey Bay, California, from December 2005 through March 2006. We found that density estimates of all birds combined and of Western Aechmopho...
متن کاملRelationship of Marbled Murrelets with Habitat Characteristics at Inland Sites in California
We examined the range and the relationships of Marbled Murrelet (Brachyramphus marmoratus) behavior with habitat and landscape characteristics in isolated old-growth and residual forest stands from 2 to 400 ha in California. In large contiguous stands of old-growth forest in parks, we examined relationships of murrelet detections with elevation and topography. In isolated stands we found higher...
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ژورنال
عنوان ژورنال: The Auk
سال: 2001
ISSN: 1938-4254,0004-8038
DOI: 10.1093/auk/118.4.1036